UE5.1 shipping packaged game renders landscape

UE5 seems to package up the chequered floor and mountain terrain map by default. It appears when I run a simple application, even though I am not loading any maps. I was hoping for an empty black screen.

I am only coding a 2D game using Paper2D. In UE4.27 I can get a good 60 FPS but with a practically empty project in UE5, I get 9 FPS!

Anyone know how to exclude default content and also are there any config parameters to turn off some features to increase the FPS?